Answer:
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Answer:
50 black keys
Step-by-step explanation:
for every set of 7 white keys there are 5 black keys
72/7 = 10
so there is a total of 10 full sets of keys
then you have 2 white keys remaining but that doesn't matter because they will just be on the dies and already have a black key next
so this means that you only have to calculate the number of 10 sets of black keys and thats 5 x 10.
hope this helps : )
A ratio that is equivalent to 20% is
1:5
2:10
3:15
4:20
5:25
6:30
Ect..
14% of 81
14\100 x 81=11.34
